Apparatus for mixing wet and dry cement materials



(No Model.) 2 SheetsSheet 1.

H, FROEHLING. ARPARATUS FOR MIXING WET AND DRY CEMENT MATERIALS.

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(No Model.)

H. FROEHLING. ARPARATUS FOR MIXING WET AND DRY CEMENT MATERIALS.

Patented Apr. 11', 1893.

UNITED STATES PATENT OFFICE.

HENRY FROEHLING, OF RICHMOND, VIRGINIA.

APPARATUS FOR MIXING WET AND DRY CEMENT MATERIALS.

SPECIFICATION forming partof Letters Patent No. 495,323, dated April 11, 1893.

Application filed April '7, 1892. Serial No. 428,192. (No model.)

To aZZ whom it may concern:

Be it known that I, HENRY FROEHLING, of Richmond, in the county of Henrico, in the State of Virginia,have invented new and useful Improvements in Processes of and Apparatus for Mixing Materials for Making Portland Cement and for other Purposes, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to machinery and apparatus for mixing Wet or dry materials by a continuous process creating a homogeneous c0mpound,whether the materials are of equal or varying proportions.

My object, primarily, is to produce an improved process and apparatus for mixing wet marl and dry clay, in certain proportions, as a part of the process of manufacturing Portland cement, and by which the various ingredients are thoroughly mixed, and discharged therefrom in a homogeneous mixture, all being continuous, and in a controllable manner, and in which the proportions of the ingredients can be regulated and controlled, and the feed is always regular, even and continuous, according to the set of the apparatus.

My invention consists in the novel process and apparatus therefor hereinafter described and which are specifically set forth in the claims hereunto annexed. It is constructed as follows, reference being had to the accompanying drawings, in which Figure 1, is a sectional elevation of the apparatus, complete. Fig. 2, is a transverse section of the feed-box on line so, in Fig. 3. Fig. 3, is a longitudinal section on line 1 in Fig. 2. Fig. 4 is a side elevation thereof. Fig. 5, is a front elevation.

In this specification I will confine the description of the apparatus to its use in mixing materials for the manufacture of Port it to the mixing of the ingredients of other compounds, where the number of such ingredients is greater.

A--, is an ordinary pug mill erected substantially horizontal, the means for feeding the material, wet marl, into it and the mechanism for rotating the shaft a being omitted as they are of ordinary construction. The

shaft -a is provided with flights a. of ordinary construction and adapted to agitate, pulverize and stir up the marl, and also to feed it longitudinally to the discharge a which conducts said marl, still wet, and in a semi-plastic condition,into the brick machine B, erected upon the support B'- and provided with avertically erected shaft bprovided with flights -b which still further stir up, pulverize and disintegrate the wet marl, and also with a lower flight b, shown in dotted lines in Fig. 1, which forces the wet marl out through the discharge b. This shaft is driven by the gearing -cactuated by the drive shaft c mounted in suitable hangers.

From the brick machine the wet marl is discharged into a horizontal or substantially horizontal'pug mill D- in a compact and homogeneous bar, said mill being provided with acentral shaft d having flightsd' and is driven by the gearing --e, pulley e and belt e" actuated by the main drive shaft .c, substantially as shown.

The pug-mill A and the brick machine B- constitute the primary elements of the apparatus, in which the main ingredient is prepared to receive the other, or lesser ingredientsin proportion.

E, represents an auxiliary feed-box, supported in a higher plane than the pug-mill D and adapted to discharge into it, through the same opening through which the marl enters it, after it has been discharged from the brick machine. In making Portland cement,Ifeed the previouslydried and ground clay, through the spout finto this feedbox. This consists of a substantially vertical sided box, having a hopper shaped bottom g, provided with a suitable discharge orifice. In the bottom of the box proper, and below the guide-boards h, which are longitudinal and transverse to said box-body, I mount the feed rollers k, each provided with the longitudinal V-shaped grooves, as shown, mounted upon central arbors, which are journaled' upon said box body andare provided onone end with intermeshing gears kwhich cause both rollers to rotate inwardly or toward each other, one of said arbors being driven by means of a pulley m-, belt -m and pulley -mon the main drive-shaft a'. In the feed-box I place a sliding feed regulating partition 'n adapted to traverse the box when the screw n is operated through the nut n secured on the box, by means of the hand wheel,said partition being also provided with guide rods p-secured thereto and adapted to traverse their hearings in the end of the box, said rods also operating to maintain said partition in a vertical position, and one of them being provided with a pointer p' which is contiguous to the scale-beam p", so that the scale thereon will always indicate the distance the partition has traversed the box, or the amount of the box which is open to receive the material, so that, therefore, the feed of the materials through between said rolls is graduated and regulated by the position of said partition, which regulates the engagement of the rolls with the material, and regulates the length of their bite into the material. From this feed-box the dry clay is discharged onto the bar of wet marl, ejected from the brick machine, and the two materials, in their proper proportions, pass into the pugmill D where they are thoroughly stirred and mixed together andcommingled, and in thiscondition are discharged from this mill, ready to be made into bricks by any ordinary apparatus and burned and ground in the usual manner: but as these later steps have nothing to do with my invention, I do not show or describe any apparatus either for brick making, burning or grinding after burning; and, therefore, only show and describe as my invention, the apparatus for proportionally mixing the ingredients by a continuous process, and in a controllable manner.

What I claim as my invention, and desire to secure by Letters Patent, is I l. The combination with the pug-mill, the brick-machine connected to its discharge opening, of the feed-box consisting of a body having a hopper-shaped bottom and the discharge orifice therefrom, longitudinal grooved grinding rollers mounted in said body above the discharge orifice, and adapted to be rotated inwardly, and the vertical partition above said roller, reciprocated longitudinally to said rollers by a hand screw connected to it and passing through a nut on said body, said brick-machine and feed-box being arranged to commingle their discharge, a second pug mill receiving said commingled matters, a scale-bar attached to said body, and a pointerbeam mounted upon said partition and passing outward through said body and provided with a pointer upon its outer end,to indicate upon said scale the distance of the longitudinal traverse of the partition.

2. In a mixing apparatus, a feed box consistin g of a body having a hopper-shaped bottom and discharge orifice therefrom, longitudinalrollers mounted in the bottom of the body, provided with the V-shaped longitudinal grooves and adapted to be rotated inwardly, and a vertical sliding partition in said body, standing transverse to said rollers, and a hand screw passing through a nut upon said body and centrally connected to said partition, whereby the latter is adjusted longitudinally above said rollers and longitudinally thereto.

3. The combination with the pug-mill, the brick-machine receiving the discharge therefrom of the feed-box provided with feed-rolls having longitudinal V-shaped grooves and adaptedto be rotated inwardly, and with a sliding partition transverse to said rollers, and means to adjust it longitudinally in the box to vary the feed of the rollers, and a pug-mill receiving the commingled discharges from said brick-machine and feed-box.

4. The combination with the pug-mill, the brick machine receiving the discharge therefrom, of the feed-box provided with feed-rolls having longitudinal V-shaped grooves and adapted to be rotated inwardly, and with a sliding partition and means to adjust it longitudinally in the box to vary the feed of the rollers, and a pug-mill receiving the commingled discharge from said brick machine and feed-box, a scale and a pointer moved by the traverse of the partition aforesaid, to indicate the feed, from the feed-box.

In witness whereof I have hereunto set my hand this 5th day of April, 1892.

HENRY FROEI-ILING. In presence of- C. W. SMITH, HOWARD P. DENISON. 

